9 Sep 1944German U-boat U-484 was sunk in the North Atlantic north-west of Ireland, in position 55°45'N, 11°41'W, by depth charges from the British corvette HMS Portchester Castle (Lt. A.G. Scott, RNR) and the British frigate HMS Helmsdale (Cdr. P.W. Burnett, DSC and Bar, RN).

Sources

ADM 173/17764

ADM 173/17765

File 2.12.03.6372 (Dutch Archives, The Hague, Netherlands)

ADM numbers indicate documents at the British National Archives at Kew, London.